netdev - Re: [PATCH v2] net: fix IPv6 prefix route residue

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Date:   Tue, 12 Feb 2019 15:43:10 +0800
From:   Zhiqiang Liu <liuzhiqiang26@...wei.com>
To:     David Miller <davem@...emloft.net>
CC:     <kuznet@....inr.ac.ru>, <yoshfuji@...ux-ipv6.org>,
        <0xeffeff@...il.com>, <edumazet@...gle.com>,
        <netdev@...r.kernel.org>, <mingfangsen@...wei.com>,
        <zhangwenhao8@...wei.com>, <wangxiaogang3@...wei.com>,
        <zhoukang7@...wei.com>, <dsahern@...il.com>, <thaller@...hat.com>,
        <maowenan@...wei.com>
Subject: Re: [PATCH v2] net: fix IPv6 prefix route residue

> From: Zhiqiang Liu <liuzhiqiang26@...wei.com>
> Date: Mon, 11 Feb 2019 10:57:46 +0800
> 
>> From: Zhiqiang Liu <liuzhiqiang26@...wei.com>
>>
>> Follow those steps:
>>  # ip addr add 2001:123::1/32 dev eth0
>>  # ip addr add 2001:123:456::2/64 dev eth0
>>  # ip addr del 2001:123::1/32 dev eth0
>>  # ip addr del 2001:123:456::2/64 dev eth0
>> and then prefix route of 2001:123::1/32 will still exist.
>>
>> This is because ipv6_prefix_equal in check_cleanup_prefix_route
>> func does not check whether two IPv6 addresses have the same
>> prefix length. If the prefix of one address starts with another
>> shorter address prefix, even though their prefix lengths are
>> different, the return value of ipv6_prefix_equal is true.
>>
>> Here I add a check of whether two addresses have the same prefix
>> to decide whether their prefixes are equal.
>>
>> Fixes: 5b84efecb7d9 ("ipv6 addrconf: don't cleanup prefix route
>> for IFA_F_NOPREFIXROUTE")
>> Signed-off-by: Zhiqiang Liu <liuzhiqiang26@...wei.com>
>> Reported-by: Wenhao Zhang <zhangwenhao8@...wei.com>
> 
> Applied and queued up for -stable.Thank you for applying the patch.
> 
> Please do not split up long Fixes: tag lines, keep the entire tag on
> one line only.
> 
> I fixed it up for you this time.
> 
> Thanks.
This is the first patch in my life. Thank you and David Ahern again.